- #26

Haelfix

Science Advisor

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If you are saying that the RNG flow equations are fundamental, you won't get an argument out of me. The nature of these equations determines exactly when, where and what renormalization means (indeed what it means at a nonperturbative level).

Yes, sometimes these equations say: 'hi, im flowing to a nontrivial nongaussian fixed point' in which case all that means is you can't renormalize the theory perturbatively, but the theory isn't necessarily doomed as it could still make sense nonperturbatively.

All im saying is there are exactly solvable field theories that have been experimentally verified, whereby the renormalization procedure is perfectly well understood at a physical level. We know exactly what it means and we can *see* why we have to use it to match the nonperturbative *result*.